1. Some members were not receiving emails sent from XJbikes.com. For example: "Forgot your password?" function to reset your password would not send email to some members. I believe this has been resolved now. Please use "Contact Us" form (see page footer link) if you still have email issues. SnoSheriff

    Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

What type of plugs do you use?

Discussion in 'XJ Technical Chat' started by corner27, Jun 9, 2008.

  1. corner27

    corner27 Member

    Messages:
    42
    Likes Received:
    1
    Trophy Points:
    6
    Location:
    Manitoba, Canada
    Hello,
    I just bought a 1980 XJ650 Maxim that has been sitting for 6 years. It runs, but I'd like to replace the plugs. They are all black. The number on the plugs are RN7YC (champion). The manual I have says to use BP7ES (NGK). What plugs do you guys use in your bikes?
    Thanks
     
    corner27, Jun 9, 2008
    #1
  2. MN-Maxims

    MN-Maxims St. Paul Minnesota

    Messages:
    3,067
    Likes Received:
    114
    Trophy Points:
    63
    Location:
    Saint Paul, MN
    I popped for the extra, Iridium plugs. They seem to work well
     
    MN-Maxims, Jun 9, 2008
    #2
  3. corner27

    corner27 Member

    Messages:
    42
    Likes Received:
    1
    Trophy Points:
    6
    Location:
    Manitoba, Canada
    do you happen to know what number those would be?
     
    corner27, Jun 9, 2008
    #3
  4. RickCoMatic

    RickCoMatic Well-Known Member

    Messages:
    13,843
    Likes Received:
    66
    Trophy Points:
    48
    Location:
    Massachusetts, Billerica
    Iridium Plugs are for Fuel Injected Bikes.
    Bikes that are Dialed IN and don't need so much as another Tweak.
    Perfect burners ...

    Until you have Plug Chopped a few times and see that you have a Tuned-up and Dialed-In Bike, Iridium's are an extravagance you don't need.

    Just get a reliable set of Spark Plugs and do your tuning until the colorization is uniform and correct ... right across the board.

    NGK's or Champions will do the job and get you all the spark you need.
    If you are confident that your Carbs are Tuned to where you can't get another ounce of performance out of them and know the set-up from the last time you tweaked ... splurge and you get bragging rights.

    Performance wise ...
    Champion RN9YC's in a Platinum Plug will give you thousands of miles of trouble free riding without worrying about missing a beat!
     
    RickCoMatic, Jun 10, 2008
    #4
  5. leadboots

    leadboots Member

    Messages:
    217
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    aylmer ontario canada
    I run bp7es but ima try bp6es
     
    leadboots, Jun 10, 2008
    #5
  6. TheHound

    TheHound Active Member

    Messages:
    1,156
    Likes Received:
    1
    Trophy Points:
    36
    Location:
    Scotia, NY
    My bike calls for BP7ES plugs.
    Remember lower number, hotter plug.
    I was told by the mechanic to run the 8's for long slab trips to keep 'er cooler.
     
    TheHound, Jun 10, 2008
    #6
  7. spinalator

    spinalator Member

    Messages:
    674
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Regina, CANADA
    Rick what is the difference between the resistor and non resistor plugs? I assume if there is a 5ohm resistor in the cap, you dont need one in the plug?
     
    spinalator, Jun 10, 2008
    #7
  8. RickCoMatic

    RickCoMatic Well-Known Member

    Messages:
    13,843
    Likes Received:
    66
    Trophy Points:
    48
    Location:
    Massachusetts, Billerica
    Don't run a HOT Plug in an Aluminum Engine.

    The engine runs hotter and the Plug can cause Pre-Ignition which is Pinging!

    Ping is Knocking.

    If you hear knocking in an Aluminum Engine ... you better believe that it ain't opportunity knocking! It's you engine getting hammered!

    Run the right Plug!
     
    RickCoMatic, Jun 10, 2008
    #8
  9. spinalator

    spinalator Member

    Messages:
    674
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Regina, CANADA
    I only ask since when I run the champion model selector it throws out both the resistor and non resistor plug.

    Champion Traditional spark plug 415 RN9YC .032 $2.24
    Champion Traditional spark plug 300 N9YC .032 $2.24

    Thanks as always, for the quick responses!
     
    spinalator, Jun 10, 2008
    #9
  10. RickCoMatic

    RickCoMatic Well-Known Member

    Messages:
    13,843
    Likes Received:
    66
    Trophy Points:
    48
    Location:
    Massachusetts, Billerica
    They don't cause electrical interference with the radio?
    I dunno.
    I know my bikes run really good with 'em ... so. I use 'em!

    Gimme a good reason to change and I'll do it!
    But, not before I take my annual long ride over to my sisters and go up North in Vermont.
     
    RickCoMatic, Jun 10, 2008
    #10
  11. corner27

    corner27 Member

    Messages:
    42
    Likes Received:
    1
    Trophy Points:
    6
    Location:
    Manitoba, Canada
    The only reason I asked, was because the local store doesnt carry the champion plug I need. I think I will try the BP7ES, if they have it that is.
     
    corner27, Jun 10, 2008
    #11
  12. switch263

    switch263 Member

    Messages:
    525
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Austin, TX
    That's what I've got in my SECA, advance auto parts had them here. I think they're a fairly common plug, as all my local stores claimed to have them in stock. I just bought them from advance because its the closest to my house. :twisted:
     
    switch263, Jun 10, 2008
    #12
  13. corner27

    corner27 Member

    Messages:
    42
    Likes Received:
    1
    Trophy Points:
    6
    Location:
    Manitoba, Canada
    The NGK web site says to use BPR7ES. What's the difference between those ans the BP7ES?
     
    corner27, Jun 10, 2008
    #13
  14. Gamuru

    Gamuru Guest

    Messages:
    1,275
    Likes Received:
    19
    Trophy Points:
    38
    Location:
    Granite Falls, WA
    R=Resistor for radio noise supression.
     
    Gamuru, Jun 10, 2008
    #14
  15. corner27

    corner27 Member

    Messages:
    42
    Likes Received:
    1
    Trophy Points:
    6
    Location:
    Manitoba, Canada
    any advantage/disadvantage?
     
    corner27, Jun 10, 2008
    #15
  16. Gamuru

    Gamuru Guest

    Messages:
    1,275
    Likes Received:
    19
    Trophy Points:
    38
    Location:
    Granite Falls, WA
    NGK has a really good write-up on Spark Plug Technology.

    If you've ever wondered what all those letters and numbers mean in an NGK plug number you can find the answers here (.pdf).

    B = Thread Diameter (B = 14mm)
    P = Tip Construction (P = Projected Insulator Type)
    R = Resistor Type
    7 = Heat Rating Number (7 = Medium)
    E = Thread Reach (E = 19mm or 3/4")
    S = Firing End Construction (S = Standard 2.5mmØ center electrode)
     
    Gamuru, Jun 10, 2008
    #16
  17. Gamuru

    Gamuru Guest

    Messages:
    1,275
    Likes Received:
    19
    Trophy Points:
    38
    Location:
    Granite Falls, WA
    Resisted plugs are required on newer vehicles with sensitive electronics or where radios are installed. They help to prevent that annoying hum on the radio that occurs with engine speed. A stock bike has neither so, no, I see no benefit.
     
    Gamuru, Jun 10, 2008
    #17
  18. spinalator

    spinalator Member

    Messages:
    674
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Regina, CANADA
    The cross reference charts say that the Champion N9YC = BP6ES, which is a hotter plug than the BP7ES.

    The N7YC is apparently = BP7ES.

    So I do not want/need hotter plugs, so I guess I will look for the N9YC at my parts store.

    This is giving me a migraine. ;)
     
    spinalator, Jun 10, 2008
    #18
  19. Gamuru

    Gamuru Guest

    Messages:
    1,275
    Likes Received:
    19
    Trophy Points:
    38
    Location:
    Granite Falls, WA
    Most spark plug cross-references carry the warning that they are for reference purposes only (or something to that effect). From them, you can get general information, but apply to that a healthy dose of common sense... like knowing which heat range you're suppose to run and adjusting accordingly.
     
    Gamuru, Jun 10, 2008
    #19
  20. corner27

    corner27 Member

    Messages:
    42
    Likes Received:
    1
    Trophy Points:
    6
    Location:
    Manitoba, Canada
    Who knew there was so much information on just stupid spark plugs
     
    corner27, Jun 10, 2008
    #20

Share This Page